The main components of the laser scanner unit are the laser driver and the scanner motor unit and are controlled by the signals sent from the DC controller.

Photosensitive drum

(Y)

Photosensitive drum

2.3.2 Laser Scanner Motor Control

2.3.2.1 Fault Detection

1. Scanner motor failure

- The scanner motor does not reach a specified rotation within a specified period after starting-up the laser scanner motor.

- The rotation of the scanner motor is out of specified range for a specified period during scanner motor drive.

2. BD failure

- The BD interval is detected at out of a specified value during a print operation.

2.4 IMAGE FORMATION SYSTEM

2.4.1 Overview/Configuration

2.4.1.1 Outline

The image-formation system is the central hub of the printer. It forms the toner image on the media.

The following are the main components of the image-formation system:

- Four cartridges

- ITB

- Laser scanner unit

- Fixing unit

The DC controller controls the laser scanner unit and high-voltage power supply to form the toner image on the photosensitive drums according to the VIDEO

signals. The image is transferred to the print media through the ITB and fixed.

2-2

Polygon mirror

Scaner motor unit

(M)

Photosensitive drum

(C)

Photosensitive drum

(Bk)

DC controller

Main controller

F-2-2